AP Gravitational Field

Two isolated masses m₁ and m₂ are separated by a distance r. Which expression gives the gravitational field strength caused by m₁ at m₂?

• G m₁m₂/r

• G m₁m₂/r²

• G m₁/r²

• G m₂/r²

What is numerically equal to the gravitational field strength at a point P on the Earth's surface?

• the acceleration of free fall at P.

• the change in potential energy per unit distance from P.

• the force acting on any body placed at P.

• the work done in bringing unit mass from infinity to P.

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The direction of a gravitational field is

• in the same direction as gravitational attraction.
• away from the center of gravity of an object.
• opposite to the direction of gravitational attraction.

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If you drop a stone into a hole drilled all the way to the other side of Earth (neglect the molten core), the stone will

• come to an abrupt stop at Earth's center.
• speed up until it gets to Earth's center
• speed up until it reaches Earth's other side.
• slow down until it reaches Earth's center.

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Gravitational field strength is measured in:

• N
• J/kg
• m/s
• N/kg

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The definition of gravitational field strength is:

• The region of space surrounding a body where other bodies will feel an attractive force due to it.
• The region of space surrounding a body where other bodies will feel an repulsive force due to it.
• The region of space surrounding a charge where other charges will feel an attractive force due to it.
• The region of space surrounding a charge where other charges will feel an repulsive force due to it.

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The closer together the gravitational field lines.....

• the weaker the gravitational field strength
• the stronger the gravitational field strength
• the more repulsive the gravitational field strength

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Any object with mass is surrounded by a gravitational field.

• True
• False
• Inconceivable
• Star Wars!

A body of mass 20 kg mass is placed 4 m

above the Earth's surface. The value of g

may be taken as lOms^-2 . What are the gravitational field strength and gravitational force acting on the body?

• A

• B

• C

• D

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Calculate the acceleration due to gravity on Mars. Its radius is 3,400,000 m and its mass is 6.42 x 10²³ kg.

• 1.6 m/s²

• 3.4 m/s²

• 3.7 m/s²

• 4.1 m/s²